急！新prep2-95

taixiKim

95.   (28538-!-item-!-188;#058&002980)

 

Which of the following most logically completes the passage?

Using new detection techniques, researchers have found trace amounts of various medicinal substances in lakes and rivers.  Taken in large quantities, these substances could have serious health effects, but they are present in quantities far too low to cause any physiological response in people who drink the water or bathe in it.  Nevertheless, medical experts contend that eliminating these trace amounts from the water will have public health benefits, since __________.

A. some of the medicinal substances found in lakes and rivers are harmless to humans even if taken in large quantities

B. some of the medicinal substances found in lakes and rivers can counteract possible harmful effects of other such substances found there

C. people who develop undesirable side effects when being treated with medicines that contain these substances generally have their treatment changed

D. most medicinal substances that reach lakes or rivers rapidly break down into harmless substances

E. disease-causing bacteria exposed to low concentrations of certain medicinal substances can become resistant to them (E)

why not D， the answer is E

xfi883

原文要求填写“这种微量药物”的缺点，但D选项说的是优点：大多数药物在水中很快分解成无害（harmless）物质。

你是不是把harmless看成了harmness?

[此贴子已经被作者于2009-6-29 7:13:52编辑过]

amumu

B 为什么不对？因为“some”？

sunjin1988

B说出了他的优点啊can counteract possible harmful effects 

cannahere

E项是啥意思？.

qqiaoer

E的意思是：致病细菌接触到这些低浓度的 medicinal substances 会变得对medicinal substances 有抵抗力。

不知道我翻译的是否正确
但是按照我翻译的理解，我还是不认为这个选项可以解释原文的结论。

当然其他几个选项比较容易排除。

有牛牛帮忙解答一下？

万分万分感谢！

hughlv

E的意思是：致病细菌接触到这些低浓度的 medicinal substances 会变得对medicinal substances 有抵抗力。

不知道我翻译的是否正确
但是按照我翻译的理解，我还是不认为这个选项可以解释原文的结论。

当然其他几个选项比较容易排除。

有牛牛帮忙解答一下？

万分万分感谢！

-- by 会员 qqiaoer (2010/3/8 23:02:47)

这个选项需要一些推理：湖水中存在低浓度药物 --> 长期药物熏陶后，disease-causing bacteria产生抗药性 --> 人们喝水或者洗澡摄入这些disease-causing bacteria --> 生病 --> 去医院治疗 --> 医生开出这些药 --> 因为抗药性导致这些药无效 --> 结论：应该消除这些药以避免disease-causing bacteria产生抗药性。

cannahere

E的意思是：致病细菌接触到这些低浓度的 medicinal substances 会变得对medicinal substances 有抵抗力。

不知道我翻译的是否正确
但是按照我翻译的理解，我还是不认为这个选项可以解释原文的结论。

当然其他几个选项比较容易排除。

有牛牛帮忙解答一下？

万分万分感谢！

-- by 会员 qqiaoer (2010/3/8 23:02:47)

这个选项需要一些推理：湖水中存在低浓度药物 --> 长期药物熏陶后，disease-causing bacteria产生抗药性 --> 人们喝水或者洗澡摄入这些disease-causing bacteria --> 生病 --> 去医院治疗 --> 医生开出这些药 --> 因为抗药性导致这些药无效 --> 结论：应该消除这些药以避免disease-causing bacteria产生抗药性。

-- by 会员 hughlv (2010/3/9 11:40:16)

明白了，谢谢

lovepiao

明白啦~和LZ犯的一样的错误

jessiecg

C为什么不对啊？